VOL-1690: Use revision based compaction

Defaults to keeping 10 change revisions in etcd
Also use current 3.4.1 etcd

Change-Id: I458861a61c6a78ee0fc6f9579447eb13e597827a
diff --git a/voltha/requirements.yaml b/voltha/requirements.yaml
index f671d8a..1062c2d 100644
--- a/voltha/requirements.yaml
+++ b/voltha/requirements.yaml
@@ -20,5 +20,5 @@
     condition: private_kafka_cluster
   - name: voltha-etcd-cluster
     repository: file://../voltha-etcd-cluster
-    version: 2.1.0
+    version: 2.1.1
     condition: private_etcd_cluster